Hi, all. First post. I play a Warmoth fretless jazz-style bass. I just picked up an Acoustic AB50 today. Nice amp so far but... The first thing I noticed is that the E string is almost dead up until the A position. Then it gets loud and sounds more like the other three strings (except a little tubbier). I recently strung the bass with Pyramid Gold flat wounds. I've had the bass for over 20 years and never noticed this issue before. Anyone had any experience with either the amp or dead notes on the E?